The aim of this work is the theoretical analysis and measurement of a truncated compound parabolic concentrator prototype with bifacial cells, filled with dielectric, made at the E.U. de Ingeniería Técnica Industrial de Jaén (Granada University). The prototype filled with a transparent mineral oil of refraction index n = 1.47, has a final meridian acceptance angle of ± 21° and it is truncated at 65% with a total height of 10 cm. The concentrator contains only one bifacial cell of 2 cm × 0.87 cm for minimizing the effects of its finite length. The rest of the collector area is simulated by a black plate. The mirror surface is made by deposition of evaporated aluminium. The theoretical analysis is based on a ray-tracing made with a computer. In this way we obtain some figures of merit which characterize this concentrator [A. Luque, Solar Cells, 3, 355 (1981)]. This calculation takes into account the concentrator losses (the reflection of mirror and cell, and oil absorption). The experimental analysis is based on a real ray-tracing on the prototype made by means of a laser. We measured the short circuit current of the cell for different incidence angles of the laser beam. There is a very close relationship between the theoretical and experimental results of the ray-tracing. So, we have proved the validity of the theoretical analysis. Also we have developed a method for performing experimental measurement closely related with the theoretical analysis of static and quasi-static concentrators. Finally, we conclude that the results of this analysis encourage us to think of the truncated CPCs as adequate solutions for static and quasi-static photovoltaic concentrators. © 1987.
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